package com.dp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.dp.dto.LoginFormDTO;
import com.dp.dto.Result;
import com.dp.dto.UserDTO;
import com.dp.entity.User;
import com.dp.mapper.UserMapper;
import com.dp.service.IUserService;
import com.dp.utils.RegexUtils;
import com.dp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.dp.utils.RedisConstants.*;
import static com.dp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    //发送验证码功能
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1. 校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合 返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合 生成验证码
        String code = RandomUtil.randomString(6);
        //4.保存验证码到session
//        session.setAttribute("code", code);
        //4.保存验证码到redis   set key value ex 120
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.info("发送短信验证码成功：{}", code);
        //返回ok
        return Result.ok();
    }

    //验证码登入功能
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.验证手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合 返回错误信息
            return Result.fail("手机号格式错误");
        }
        // TODO 2.校验验证码 之前是session 现在改为redis
//        Object cacheCode = session.getAttribute("code");
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null) {
            //3.不一致报错
            return Result.fail("验证码为空");
        }
        if (!cacheCode.equals(code)) {
            log.info("前端传入验证码：{}", code);
            return Result.fail("验证码错误");
        }
        //4.一致 根据手机号查询用户  select * from tb_user where phone=?
        User user = this.query().eq("phone", phone).one();
        //5.判断用户是否存在
        if (user == null) {
            //6.不存在 创建新用户
            user = createUserWithPhone(phone);
        }
        UserDTO userDTO = new UserDTO();
//        userDTO.setNickName(user.getNickName());
//        userDTO.setId(user.getId());
//        userDTO.setIcon(user.getIcon());
        BeanUtils.copyProperties(user, userDTO);
        Map<String, Object> map = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).
                        setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString())); //所有字段转为字符串
        //TODO 7. 保存用户信息写入session
        //TODO 7.1 随机生成token 作为登入令牌
        String token = UUID.randomUUID().toString(true); //是否带中划线
        //TODO 7.2  将User对象转为hash存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, map);
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
        session.setAttribute("user", userDTO);
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        // 1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        // 4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.写入Redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        // 1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        // 4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.获取本月截止今天为止的所有的签到记录，返回的是一个十进制的数字
        // BITFIELD sign:5:202203 GET u14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create().
                        get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        //6. 循环便利
        if (result==null||result.isEmpty()){
            //没有任何结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num==null){
            return Result.ok();
        }
        int count=0;
        while (true){
            //7. 与1做与运算 得到数字的最后一个bit位
            //   判断这个bit位是否为0
            if ((num &1)==0){
                //如果为0 说明未签到 结束
                break;
            }else {
                //如果不为0 说明已签到 计数器+1
             count++;
            }
            //把数字右移一位  抛弃最后一个bit位  继续下一个bit位
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //1.创建新用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.保存用户
        this.save(user);
        return user;
    }
}
